Improvement in casting metal



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11011.046 Pmmmnzmso A Vdc' l0, l

' which consists of .a cavity UNITED STATES PATENT OFFICE ROBERT ROSS, OF'MIDDLEBURY,ASSIGNOR TO IIIlllSELF, VYATT \V. PIERCE,

lAND GEORGE ROSS, OF VERGENNES, VER-MONT.

i IMPROVEMENT IN CASTING fIIIIIETIIII..

Specification forming part of Letters Patent No. 101,046, dated March Q2, 1870.

.To all whom lit may concern:

of Vermont, have invented a new and useful Improvement in Casting Metal; and I do hercby declare that the follow-ing is a full, clear, and exact description thereof, which will ena ble others skilled in the art to make and use the same.

lhis invention relatesto improvements in casting molten metal, whereby it is designed to provide sound-er castings than can be made by the present mode. The invention consists in providing traps in the passages through which the molten metal flows when running into the Inolds, to take out the dirt and all impurities in the inetal which rise to the surface after t-he molten metal has settled, as hereinafter more fully described.

All cast-irolnhas some impurities, and when melted and allowed -to cool the said impurities rise to the top, where they are always found in'the castings. Founders use what are called 1-ise1's, which are holesor cavities in the cope or top part of. the mold, for these impurities to risc up in above the required surface of the casting. The parts of the metal formed in these risers, and which are composed mainly of these impurities, are broken or cut oli' after the castings are removed from the molds. This plan only lpartly removes the diiiiculty, for, by it, tol get soundcastings, the risers should-be as large as the castings, as the said impurities adhere to the top of the mold, and do not dow over the surface of the metal to the risers to any material extent; consequently they take up onlyja small portion, which rises directly under them.

To obvate these diiculties I propose. to form in the sami below and communicating wit-h the sprue, what I term a stodge77 gate, or trap carried below the points of entry for the molten metal into `the molds, and from the bottom ofthis cavity to the said molds I arrange one or more y passages or gates leading upward inio the said molds.

I will now exemplify my invention by the figures shown in the drawin gs hereto attached. Figure l represents a cross-section of a mold and flask, and Fig. 2 a plan'vicw of the same. d is the space iu the mold for giving shape to the article. a is the spruc-hole, and bl a chamber through which the molten metal must pass before it enters thechamber d through the upward incline c.

By this arrangement themetal, on being poured in, will rise in thesais cavity to a level with the opening of the Iassages into the mold before any metal can flow therein, and consequently the .stodge or light impurities will be retained on the surface of the l metal in the said cavity, and only thc pure and heavier `metal will rind its way into the molds. This improved mode of casting molten metal l is applicable to molds of all forms and character.V

The said cavities maybe of any preferred size or form; they may be best made in an angular direction relatively tothe'surface of the ground, or the planes of thejm'olds inicliib,H ing downward, and the gates leading from'the bottom should beinclined upward tothe molds. f

.The walls of these cavities may be lplain or corrugated, as found best.

Having thus described my invention, I claim asnew and desire to secure by Letters Patent I The arrangement, in a mold, of I. a chamber, b, under the spruehole,'and having' an 11pwardly-inclined channel, c, through which the molten metal passes into the shaping-mold d, all as shown and described. l

, ROBERT-BOSS. Witnesses:

H. W; BREWsTER, JOHN H. SIMMONS. w 

